# Incrementing value in an executing loop

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FIR on 26 Jul 2012
I have a matrix A =
12 13 6 7
5 4 5 1
2 2 11 13
7 1 3 6
and the following code:
%%%%(th=threshold)
th=4
for i=1:4
for j=1:4
if A(i,j) < th
A(i,j) = 0;
G=nnz(A);
end
end
end
I have calculated nnz where I get G=11,for threshold 4.
Now I want to automatically increment the th value such that if G is less than 5 the loop should termainate, and find the value of th when the loop terminated.
Albert Yam on 26 Jul 2012
From what I gather,
• when G == 11, you want th = 8 ?
• when G <= 5 , stop the loop?
• but if you stop the loop what does increasing 'th' do?

venkat vasu on 27 Jul 2012
Edited: Andrei Bobrov on 27 Jul 2012
th=4
for i=1:4
for j=1:4
if A(i,j) < th
A(i,j) = 0;
G=nnz(A);
if G<5
th=th+1;
break;
end
end
end
end

Andrei Bobrov on 27 Jul 2012
G=5;
th = 0;
while sum(A(:) >= th) >= G
th = th + 1;
end

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